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Development of a droplet digital PCR method for detection of Streptococcus agalactiae
Yi-Fan Zeng1,2,3,4, Chu-Mao Chen1,2, Xiao-Yan Li5
1Department of Clinical Laboratory Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China.
Insights
A new droplet digital PCR (ddPCR) method rapidly and accurately detects Streptococcus agalactiae (GBS). This sensitive and specific assay offers improved diagnosis for GBS infections in pregnant women and infants.
Area of Science:
- Microbiology
- Molecular Diagnostics
- Infectious Diseases
Background:
- Streptococcus agalactiae (GBS) causes significant morbidity in pregnant women and infants, including puerperal sepsis, pneumonia, and meningitis.
- Current GBS detection methods, such as culture-based approaches, are slow and lack sensitivity.
- Real-time quantitative PCR for GBS detection requires expensive equipment and complex procedures.
Purpose of the Study:
- To develop a novel, rapid, and accurate detection method for Streptococcus agalactiae.
- To establish a highly sensitive and specific assay for GBS identification.
Main Methods:
- Utilized droplet digital PCR (ddPCR) targeting the CpsE gene for Streptococcus agalactiae detection.
- Evaluated the limit of detection, specificity against non-GBS strains, and repeatability of the ddPCR assay.
Main Results:
- The ddPCR assay demonstrated high amplified efficiency with a limit of detection for GBS DNA as low as 5 pg/μL.
- The method showed excellent specificity, with no positive signals detected for 11 non-GBS strains.
- The ddPCR assay exhibited excellent repeatability, with a coefficient of variation of 4.5%.
Conclusions:
- Droplet digital PCR (ddPCR) provides a rapid, sensitive, and specific method for detecting Streptococcus agalactiae.
- This ddPCR technique enhances the accuracy of GBS infection diagnosis.
- The assay offers a valuable scientific basis for guiding clinical treatment decisions for GBS infections.
Background:
Streptococcus agalactiae (GBS) is the causative pathogen of puerperal sepsis in pregnant women and pneumonia, sepsis and meningitis in infants. Infection of GBS is responsible for the increased morbidity in pregnant women and the elderly, and bring challenges to clinical diagnosis and treatment. However, culture-based approaches to detect S.agalactiae is time-consuming with limited sensitivity. Besides, real-time quantitative PCR demands expensive instruments with tedious steps. Thus, we aim to establish a new detection method for more accurate and rapid detection of S.agalactiae.
Results:
The ddPCR primer targeted the CpsE gene showed better amplified efficiency in the reaction. The limit of detection for GBS DNA with ddPCR was able to reach 5 pg/μL. Moreover, no positive amplified signals could be detected in the reactions which served 11 non-GBS strains DNA as templates. Furthermore, the coefficient of variation of this method was 4.5%, indicating excellent repeatability of ddPCR assay.
Conclusions:
In our study, ddPCR was performed as a rapid detection of S.agalactiae with high sensitivity and specificity. This technique can promote the accuracy of the diagnosis of GBS infection and provide a scientific basis for clinical treatment.
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